New avatar related option - use gravatar only for registered users

Description

The use of gravater is problematic because there is no attempt to verify that a comment with which an email was used was actually left by the owner of the email (AFAICT gravatar doesn't even have an API for authentication).

This makes impersonating to someone else that have a gravatar in a wordpress site comments much too easy.

IMO non autogenerated gravatars should be displayed by default only for users for which it is known that they actually own the email address, which are usually only the registered users.

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This is an interesting point. I think the solution for this ultimately would be a plugin to verify comment author by sending an email to the account in question to confirm the comment as suggested in #10931.